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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '96741fea919f39060ce492e8744341aa844aae529cce9c6a450549a74fcad5a6' 
  AND token = '+4eHJnpCPJsgmPLufao9QtqfbzdcKtd3c0ixU1g+0PM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}